RFR: 8366948: AOT cache creation crashes when iterating training data [v2]

[Ioi Lam]

On Wed, 24 Sep 2025 17:54:32 GMT, Igor Veresov <iveresov at openjdk.org> wrote:

>> I forgot a lock around `CTD::_ci_records`. It also has to respect the snapshotting protocol. Testing is good.
>
> Igor Veresov has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Make DepList more defensive against non-MT-safe use

Marked as reviewed by iklam (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/27461#pullrequestreview-3264870849